Turning a Hackathon Prototype into a Scalable Solution

JustaLuz is a mobile app that uses on-device capture plus Gemini vision to parse Brazilian utility bills, flag inconsistencies with deterministic rules and search-grounded tariff checks, and walk users through formal billing disputes. This addresses a recurring issue in Brazil: errors and confusing charges on electricity bills. The demo showed the end-to-end workflow in the app and illustrated how the team worked on evolving a hackathon prototype into a clear and scalable architecture.